Hot-air furnace



March 20, 1928. Q 1,663,434

J. BOUCEK ET AL HOT AIR FURNACE Filed. April 1927 3 Sheets-Sheet 1 Hi 5M WITH INVENTOR We BY ATTOR N EY March 20,1928. 1,663,434

J. BOUCEK ET AL no? AIR FURNACE cs-Sheet 2 INVENTOR ATTORN EY March 20,1928.

J. BOUCEK ET AL H AIR FURNACE ts-Sheet 3 INVENTORS W ATTORNEY w M a MV///////Z.J-M

F A fimm w W///////////////////% Patented Mar. 20, 1928.

UNITED STATES 1,663,434 PATENT OFFICE.

JAMES BOUCEK, JAMES HALIGK AND JOSEPH TREFNEY, 0F CLEVElZAND, OHIO.

HOT-AIR FURNACE.

Application filed April 28, 1927. Serial No. 187,250.

This invention relates to improvements in hot air furnaces and has foran object the provision of means for supplying preheated air to the firebox of a. furnace to assist combustion, and thus materially reduce thecombustion to circulate within the furnace for the supply ofheat,-together with means to retard the passage of air through thefurnace and cause said air to be subjected to the action of the heatwithin and after it leaves the firebox. 7

Another object of the invention is the provision of a furnace-whichaccomplishes the above and other objects by means of a novel arrangement-of heat conduits and passages whereby the products of combustion arecaused to travel in different paths to heat the air admitted to thefurnace as the air circulates around these paths, so that a maximumamount of heat from the fire box is utilized.

With the above and other objects in view, the invention further includesthe following novel features and details of construction, to behereinafter more fully described,illustrated in the accompanyingdrawings and pointed out in the appended claims.

In the drawings Figure l is a front elevation of a furnace constructedin accordance with the invention, parts being broken away and shown insection.

Figure 2 is a sectional view on the line 22 of Figure 1.

"Figure 3 is a sectional view on the line 3-3 of Figure 2. I

Figures 1 and 5 are horizontal sections taken respectively on the lineslet and 5-5 of Figure 2. g

Referring to the drawings in detail wherein like characters of referencedenote corresponding parts,the reference character 9 indicates a housingwhich forms the outer wall of the furnace and is preferably built ofbrick and suitable refractory material, that is, the outside walls maybe of brick and the inside provided with a refractory lining.

The reference character 10 indicates the fire box of the furnace beneathwhich is located the grate bars 11, while beneath these grate bars isthe usual ash pit 12. The ash pit door is indicated at 13 While thefeeddoor is indicated at 14. i I I Extending inwardly from the front of thefurnace near the bottom are air inlet passages 15.' These'passagesare'controlled by dampers or doors 16, which may be'adjusted to regulatethe admission of air. The air passages 15 extend rearwardly along opposite sides' of the furnaceand behind the ash pit 12, while an'upwardlyextending passage: 17 at the rear of the ashpit communicates with apreheating chamber 18.

This'chamber 18 is provided with outlet passages 19 which are locatedadjacent the grate bars' 11', so that air entering the furnace throughthe passages 16"will travel up through the passage 17 and will circulatearound the chamber 18, and will pass from this chamber in a preheatedstate through the passages 19 and past the grate bars 11 into the firebox. 'The aijr is thus supplied 1 to the fire box in a preheated state.

-The walls 20 of the fire box are formed of suitable refractory materialand are relacommunication with an upwardly and outwardly extendingpassage 26. The lower end of the passage 26 communicates with thechamber 25 at a point substantially central of the latter, while theouter end of the conduit 26 is adapted to communicate with the furnaceflue to carry ofl the smoke and other products of combustion. A batheplate 27 is located within the chamber 25 beneath the inner end of theconduit 26.

Fresh air to be heated is admitted to the chamber 21 through openings 28provided in the housing 9. The openings 28 are relatively small and arespaced entirely around the housing, so that air entering the furnacewill be more evenly distributed than would be the case if the airentered through a single large opening. This air circulates around andover the top of the fire box and around the conduits 22, the chamber 25and conduit 26 and passes outward through openings 29 provided in thetop of the furnace. From this point the air may be distributed throughpipes 30 in the usual or any pre ferred manner. The pipes 30 extend froma hood 31 which is mounted upon the top of the furnace and with whichthe openings 29 communicate. the furnace and is in communication withthe passage 26. i

The chamber 21 is provided with a baiiie wall 31 which extends inwardlyaround the inner face of the housing 9 and acts to retard the heated airso that the latter will more readily circulate around the fire box,conduits and passages.

The invention is susceptible of various changes in its form, proportionsand minor details. of construction and the right is herein reserved tomake such changes as properly fall within the scope of'the appendedclaims. 7

Having described the invention what is claimed is:

1. A furnace comprising a housing, a tire box within the housing andhaving its top and side walls spaced from the walls of the housing toprovide an air heating chamber having communication with the atmosphere,vertically disposed conduits extending from each corner of the fire box,a horizontally disposed substantially H-shaped passage spaced above thetop of the fire box and comi A smoke pipe 32 extends from municatingwith the vertically disposed conduits, an upwardly and outwardlycentrally located conduit communicating with the P- shaped passage, andsaid passage and conduits being located within the heating charnber,whereby air within said chamber will circulate over and around thepassage and conduits before leaving the furnace.

2. A furnace comprising a housing, a lire box within the housing andhaving its top and side walls spaced from the walls of the chamber,whereby air within said chamber will circulate over and around the.passage and conduits before leaving the furnace, and a batlie' extendingaround the inside of the housing to retard the outward passage of airfrom the heating chamber.

In testimony whereof we aflix our signatures.

JAMES BOUCEL. JAMES HALICK. JOSEPH TREFNEY.

